Jumpy mouse

My mouse has been randomly jumping ever now and again; it moves about and inch or two in random direction and often leads to me clicking on things i didn't want to. Kaspersky can't find any viruses but could someone read my hijack this log for me please

EDIT

Can i also add that my internet gets allot of failure to load errors and i need to refresh (however this may be a different problem with firefox, but it has never happened before)

Thanks for the replies, i don't quite know what optics are but i've cleaned the lenzy bit on the mouse and that seems to have done the trick, also i think i need to clea the mose pad as its covered with hairs.